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Let a spherical triangle have sides of length a, b, and c, and semiperimeter s. Then the spherical excess E is given by

A method for constructing magic squares of singly even order n>=6.

Given a positive integer n, a labeled n-digraph is a digraph whose vertex set is {1,...,n}.

A Fourier series in which there are large gaps between nonzero terms a_n or b_n.

A function that has a natural boundary.

The second-order ordinary differential equation y^('')+k/xy^'+epsilony^'y=0.

A quantity involving primitive cube roots of unity which can be used to solve the cubic equation.

Coefficients which appear in Lagrange interpolating polynomials where the points are equally spaced along the abscissa.

The Lambert cylindrical equal-area projection is a cylindrical equal-area projection with standard parallel phi_s=0 degrees.

There are two curves commonly known as the Lamé curve: the ellipse evolute and the superellipse.